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Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.7: Poster

Monday, March 31, 2014, 15:00–19:00, P2

Superconductivity in epitaxial Ru-doped BaFe2As2 thin films — •Marco Langer1,2, Jan Engelmann1,2, Vadim Grinenko1, Eike Ahrens2, Fabian Nitsche3, Bernhard Holzapfel1,4, Ludwig Schultz1,2, and Ruben Hühne11Institute for Metallic Materials, IFW Dresden, PO Box 270116, D-01171 Dresden, Germany — 2Dresden University of Technology, D-01062 Dresden, Germany — 3Ludwig-Maximilians-University Munich, Department of Chemistry, D-81377 Munich, Germany — 4Karlsruhe Institute of Technology, Institute for Technical Physics, D-76344 Eggenstein-Leopoldshafen, Germany

The iron pnictide BaFe2As2 (Ba122) exhibits superconductivity either by carrier doping, chemical pressure, strain or external pressure. The key parameter for controlling the phase diagram of Ba122 is still under debate.

In order to investigate the driving factor of superconductivity in more detail we prepared thin Ba122 films with different ruthenium doping levels on single-crystal substrates using pulsed laser deposition. Structural investigations were carried out using θ-2θ x-ray diffraction and texture measurements revealing an epitaxial growth of the thin films. Electronic transport and SQUID-susceptibility measurements were performed to determine the electronic phase diagram. The results will be discussed in comparison to published phase diagrams for bulk materials.

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